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Unread 03-26-2010, 09:59 AM   #1
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Durock over Durock

New here, but trolled the forums many times. Quick question. I have a 3'x5' powder room floor that I just installed 1/2" Durock(thinset and screwed) over 3/4" ply sub-floor. Problem, toliet flange is 1/2" too high. Should have put 1/2" ply down first, but I screwed up. Is it ok to just put a second layer of 1/2" Durock over the first?
Thanks for past and future information.
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Unread 03-26-2010, 11:31 AM   #2
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I think once your thinset and tile are installed, the difference will not be problematic with installing the toilet.
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Unread 03-26-2010, 11:36 AM   #3
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While I may agree with Sam, I think it's premature to give you a precise answer w/o a little more info.

Is the bottom of your closet flange 1/2" above the surface of the Durock...or is it even higher? How thick is your tile?
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Unread 03-26-2010, 03:20 PM   #4
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Thanks for getting back to me so soon. Sorry for lack of info. I have 7/8" from top of board to bottom of flange. 1/2" Durock, tile and thinset would be perfect. The flange is an old cast one and I don't want to get involved in moving it.
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Unread 03-26-2010, 04:19 PM   #5
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Height wise, I think you'll be fine with more cbu. You will have to use longer screws/nails to get into the framing, maybe 2-1/4" HD galv roofing nails. Also, still need to set into mortar and mud/tape joints with alkali resistant mesh tape...

"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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